Momentary Push Button: Plate mounting hole 16mm, button diameter 13.5mm, long press: on, finger release: off. Up to 100% lifespan (100,000 cycles), enough for a long service life. High Quality Material: Our push button is made of chrome plated brass with PA66 nylon base, resistant to rust and corrosion, with good fire resistance and insulation, stable and durable, easy to clean. Maintenance. Waterproof and Dustproof: The pressure switch is equipped with a hex nut and O-shaped sealing ring, with IP65 and IK08 protection, heat resistance, can be used freely in humid or dusty environment. Easy to clean. Installation: Easy to install, thickened and widened silver pins. Highly sensitive contact, good conductivity and high sensitivity. The blue LED light can be permanently or instantly lit depending on the connection method. Wide Application: Often used in mobile devices, cars, trucks, ships, ignition systems, doorbells and dashboards. Ideal for circuit control in electromagnetic starters,